The Infinity60 (revision 1.1a) pcb uses the IS31FL3731C matrix LED driver from ISSI [(datasheet)](http://www.issi.com/WW/pdf/31FL3731C.pdf). The IS31 has the ability to control two led matrices (A & B), each matrix controlling 9 pins, each pin controlling 8 leds. The Infinity only utilizes matrix A.
In the Infinity60 project folder, led_controller.c sets up ability to write led layers at startup or control leds on demand as part of fn_actions. By default led_controller.c assumes page 0 will be used for full on/off and page 7 for controlling individual leds. The remaining 6 pages (1-6) are free to preset led maps at init or on demand. Communication with the IS31 is primarily done through the led_mailbox using chMBPost described further below under "Sending messages in Keymap.c"
Remaining led control is done through the led mailbox using these message types:
- **SET_FULL_ROW** (3 bytes) - row#, message type, 8-bit mask. Sets all leds on one pin per the bit mask.
- **OFF_LED** (2 bytes) - message type, led address. Turn off specific led.
- **ON_LED** (2 bytes) - message type, led address. Turn on specific led.
- **TOGGLE_LED** (2 bytes) - message type, led address. Toggle specific led on/off.
- **BLINK_OFF_LED** (2 bytes) - message type, led address. Set blink off for specific led.
- **BLINK_ON_LED** (2 bytes) - message type, led address. Set blink on for specific led.
- **BLINK_TOGGLE_LED** (2 bytes) - message type, led address. Toggle blink for specific led.
- **TOGGLE_ALL** (2 bytes) - message type, not used. Turn on/off full backlight.
- **TOGGLE_BACKLIGHT** (2 bytes) - message type, on/off. Sets backlight completely off, no leds will display.
- **DISPLAY_PAGE** (2 bytes) - message type, page to display. Switch to specific pre-set page.
- **RESET_PAGE** (2 bytes) - message type, page to reset. Reset/erase specific page.
- **TOGGLE_NUM_LOCK** (2 bytes) - message type, on/off (NUM_LOCK_LED_ADDRESS). Toggle numlock on/off. Usually run with the `set_leds` function to check state of numlock or capslock. If all leds are on (e.i. TOGGLE_ALL) then this sets numlock to blink instead (this is still a little buggy if toggling on/off quickly).
- **TOGGLE_CAPS_LOCK** (2 bytes) - message type, on/off (CAPS_LOCK_LED_ADDRESS). Same as numlock.
- **STEP_BRIGHTNESS** (2 bytes) - message type, and step up (1) or step down (0). Increase or decrease led brightness.
- message - up to 4 bytes but most messages use only 2. First byte (LSB) is the message to process, the second byte is type. The third is only used to pass row information in SET_FULL_ROW. The fourth byte is currently unused.